[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.023531] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 21.259739] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 21.544395] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 22.316122] random: sshd: uninitialized urandom read (32 bytes read, 90 bits of entropy available) [ 22.501852] random: sshd: uninitialized urandom read (32 bytes read, 96 bits of entropy available) Warning: Permanently added '10.128.15.209' (ECDSA) to the list of known hosts. [ 27.883350] random: sshd: uninitialized urandom read (32 bytes read, 103 bits of entropy available) executing program [ 27.978729] ================================================================== [ 27.986109] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0xf9/0x110 [ 27.993087] Read of size 8 at addr ffff8800b44e0140 by task syzkaller790837/3311 [ 28.000581] [ 28.002175] CPU: 0 PID: 3311 Comm: syzkaller790837 Not tainted 4.4.111-g3301b55 #24 [ 28.009929] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.019248] 0000000000000000 28c9c3b99959231a ffff8801d0b07ab0 ffffffff81d0509d [ 28.027198] ffffea0002d13800 ffff8800b44e0140 0000000000000000 ffff8800b44e0140 [ 28.035146] ffff8800b4c74438 ffff8801d0b07ae8 ffffffff814fd433 ffff8800b44e0140 [ 28.043088] Call Trace: [ 28.045641] [] dump_stack+0xc1/0x124 [ 28.050976] [] print_address_description+0x73/0x260 [ 28.057612] [] kasan_report+0x285/0x370 [ 28.063199] [] ? sg_remove_request+0xf9/0x110 [ 28.069315] [] __asan_report_load8_noabort+0x14/0x20 [ 28.076031] [] sg_remove_request+0xf9/0x110 [ 28.081973] [] sg_finish_rem_req+0x295/0x340 [ 28.087996] [] sg_read+0xa21/0x1490 [ 28.093236] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.099872] [] ? new_slab+0x2df/0x3b0 [ 28.105295] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 28.111934] [] __vfs_read+0x103/0x440 [ 28.117358] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 28.124337] [] ? vfs_iter_write+0x2d0/0x2d0 [ 28.130274] [] ? fsnotify+0x5ad/0xee0 [ 28.135688] [] ? fsnotify+0xee0/0xee0 [ 28.141101] [] ? lockdep_init_map+0xeb/0x1690 [ 28.147214] [] ? avc_policy_seqno+0x9/0x20 [ 28.153067] [] ? selinux_file_permission+0x348/0x460 [ 28.159788] [] ? security_file_permission+0x89/0x1e0 [ 28.166512] [] ? rw_verify_area+0x100/0x2f0 [ 28.172449] [] vfs_read+0x123/0x3a0 [ 28.177696] [] SyS_read+0xd9/0x1b0 [ 28.182848] [] ? do_sendfile+0xd30/0xd30 [ 28.188530] [] ? lockdep_sys_exit_thunk+0x12/0x14 [ 28.194986] [] entry_SYSCALL_64_fastpath+0x16/0x92 [ 28.201535] [ 28.203132] Allocated by task 0: [ 28.206460] (stack is not available) [ 28.210134] [ 28.211727] Freed by task 0: [ 28.214707] (stack is not available) [ 28.218381] [ 28.219982] The buggy address belongs to the object at ffff8800b44e0100 [ 28.219982] which belongs to the cache fasync_cache of size 96 [ 28.232602] The buggy address is located 64 bytes inside of [ 28.232602] 96-byte region [ffff8800b44e0100, ffff8800b44e0160) [ 28.244265] The buggy address belongs to the page: [ 28.257357] kasan: CONFIG_KASAN_INLINE enabled [ 28.261785] kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 28.274672] Dumping ftrace buffer: [ 28.278192] (ftrace buffer empty) [ 28.281890] Modules linked in: [ 28.285200] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.4.111-g3301b55 #24 [ 28.292196] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 28.301544] task: ffff8801da3a97c0 task.stack: ffff8801da3b8000 [ 28.307587] RIP: 0010:[] [] rb_insert_color+0x9f/0xcb0 [ 28.316205] RSP: 0018:ffff8801db307d18 EFLAGS: 00010003 [ 28.321638] RAX: 0a0508a8e82a0be9 RBX: ffffffff838a83a0 RCX: ffffffff838a83a0 [ 28.328896] RDX: 1ffffffff0715075 RSI: ffff8801db319710 RDI: ffff8801db319c40 [ 28.336156] RBP: ffff8801db307d60 R08: ffffffff857d0748 R09: 0000000000000001 [ 28.343416] R10: 0000000000000000 R11: 1ffff1003b660f62 R12: ffff8801d0adfdf8 [ 28.350673] R13: 5028454741505f4e R14: ffff8801db319c40 R15: dffffc0000000000 [ 28.357939] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 28.366152] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 28.372025] CR2: 000000000043e530 CR3: 00000000b52ba000 CR4: 0000000000160670 [ 28.379287] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 28.386550] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 28.393810] Stack: [ 28.395943] ffffffff842bcb20 ffff8801da3aa030 0000000000000000 ffff8801db307d70 [ 28.403959] ffff8801db319c40 dffffc0000000000 0000000000000000 ffff8801db319710 [ 28.411972] ffff8801d0adfe00 ffff8801db307db0 ffffffff81d22967 ffff8801db319c58 [ 28.419990] Call Trace: [ 28.422581] [ 28.424636] [] timerqueue_add+0x157/0x2a0 [ 28.430730] [] enqueue_hrtimer+0x168/0x450 [ 28.436608] [] __hrtimer_run_queues+0x732/0xfe0 [ 28.442944] [] ? hrtimer_fixup_init+0x70/0x70 [ 28.449088] [] ? hrtimer_interrupt+0x131/0x440 [ 28.455320] [] hrtimer_interrupt+0x1a6/0x440 [ 28.461391] [] local_apic_timer_interrupt+0x6a/0xb0 [ 28.468055] [] smp_apic_timer_interrupt+0x76/0xa0 [ 28.474542] [] apic_timer_interrupt+0xa0/0xb0 [ 28.480669] [ 28.482734] [] ? native_safe_halt+0x6/0x10 [ 28.488916] [] ? trace_hardirqs_on+0xd/0x10 [ 28.494884] [] default_idle+0x55/0x3c0 [ 28.500421] [] arch_cpu_idle+0xa/0x10 [ 28.505873] [] default_idle_call+0x48/0x70 [ 28.511754] [] cpu_startup_entry+0x605/0x820 [ 28.517809] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 28.524656] [] ? call_cpuidle+0xe0/0xe0 [ 28.530284] [] ? clockevents_register_device+0x122/0x230 [ 28.537381] [] start_secondary+0x304/0x3e0 [ 28.543309] [] ? set_cpu_sibling_map+0x1040/0x1040 [ 28.549879] Code: 48 89 c2 48 c1 ea 03 42 80 3c 3a 00 0f 85 94 09 00 00 4c 8b 6b 08 4d 39 e5 0f 84 b0 01 00 00 4d 85 ed 74 1d 4c 89 e8 48 c1 e8 03 <42> 80 3c 38 00 0f 85 95 09 00 00 41 f6 45 00 01 0f 84 20 03 00 [ 28.577004] RIP [] rb_insert_color+0x9f/0xcb0 [ 28.583264] RSP [ 28.586877] ---[ end trace de60bcd7edba6677 ]--- [ 28.591621] Kernel panic - not syncing: Fatal exception in interrupt [ 29.705443] Shutting down cpus with NMI [ 29.709941] Dumping ftrace buffer: [ 29.713457] (ftrace buffer empty) [ 29.717132] Kernel Offset: disabled [ 29.720724] Rebooting in 86400 seconds..